By door catch, do you mean door handle? If so, it's a flush part in hardcabs from what I saw on abiez videos.
No, the piece it latches to on the Roxor, it sticks out about 2-3" hip high.
I really like the cab, but I find the door opening small. I really like the way the OEM door is set back above the body line, I think it gives a much more open feeling when you have the door removed. With the Hardcab, they way the door goes straight up, it is kind of restrictive I think. I'm 6" tall but not a big guy other wise. If your over 6' and a bigger person with bulky winter clothes on, you might find the door a bit small and that latch catching your bulky winter clothes (remember I'm in Saskatchewan and use this thing is all weather). I like the door on the OEM cab, but I like the rest of this cab better I think. At least this cab can be removed if you want.
Maybe someone will come up with the best of both. lol. It won't be this year that I'd be getting one anyway and then when I do, I have to find a dealer for any cab I decide on close to the US border, then make trip to get it. Only OEM ships to Canada and I won't be getting that one for sure, due to it being permanent once installed and the price is crazy.
Fallacy has the right idea with his door.